A type of window film made to help slow down intrusions into a building through a door or window, security film is one aspect of security glazing. Security film is typically an after-market addition. It can be added only to the glass and held in place with sealant, or installers can attach it to the frame of the window or door. If the window that the film is applied to becomes broken, the film provides an extra layer of polyvinyl that will both hold broken glass together and, in those latter installations, it can hold the broken glass in the frame, which would slow or even prevent someone who is attempting to gain entry.

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